A K-band four-element dual-beam phased-array receiver with high transmit
isolation for SATCOM applications
This letter presents the design and implementation of a K-band
four-element dual-beam phased-array receiver with more than 28.14 dB
transmit-receive isolation in 65-nm CMOS SOI for SATCOM applications. By
properly designing the inter-stage and output matching networks of the
four-stage low noise amplifier, the isolation between the transmit and
receive chains of the full-duplex shared-aperture phased-array antenna
system can be effectively enhanced to meet the practical requirements.
In addition, to meet the demands of precise phase shifts of phased-array
systems, an active vector-modulated phase shifter with low power
consumption, small area occupation, and positive gain is designed. Based
on the proposed methodology, a K-band four-element dual beam
phased-array receiver operating from 17.7 to 21.2 GHz is designed and
measured. The measurement results show the transmit-receive isolation is
greater than 28.14 dB, the single-channel gain is 21.48-25.31 dB, and
the noise figure is 2.42-2.77 dB over the entire working frequency.
Meanwhile, the measured RMS gain error and RMS phase error are less than
0.43 dB and 3.8°, respectively.